Information
UARTx_S1 field descriptions (continued)
Field Description
48.3.6 UART Status Register 2 (UARTx_S2)
The S2 register provides inputs to the MCU for generation of UART interrupts or DMA
requests. Also, this register can be polled by the MCU to check the status of these bits.
This register can be read or written at any time, with the exception of the MSBF and
RXINV bits, which should be changed by the user only between transmit and receive
packets.
Address: Base address + 5h offset
Bit 7 6 5 4 3 2 1 0
Read
LBKDIF RXEDGIF MSBF RXINV RWUID BRK13 LBKDE
RAF
Write
Reset
0 0 0 0 0 0 0 0
UARTx_S2 field descriptions
Field Description
7
LBKDIF
LIN Break Detect Interrupt Flag
LBKDIF is set when LBKDE is set and a LIN break character is detected on the receiver input. The LIN
break characters are 11 consecutive logic 0s if C1[M] = 0 or 12 consecutive logic 0s if C1[M] = 1. LBKDIF
is set after receiving the last LIN break character. LBKDIF is cleared by writing a 1 to it.
0 No LIN break character detected.
1 LIN break character detected.
6
RXEDGIF
RxD Pin Active Edge Interrupt Flag
RXEDGIF is set when an active edge occurs on the RxD pin. The active edge is falling if RXINV = 0, and
rising if RXINV=1. RXEDGIF is cleared by writing a 1 to it. See for additional details. RXEDGIF description
NOTE: The active edge is detected only in two wire mode and on receiving data coming from the RxD
pin.
0 No active edge on the receive pin has occurred.
1 An active edge on the receive pin has occurred.
5
MSBF
Most Significant Bit First
Setting this field reverses the order of the bits that are transmitted and received on the wire. This field
does not affect the polarity of the bits, the location of the parity bit, or the location of the start or stop bits.
This field is automatically set when C7816[INIT] and C7816[ISO7816E] are enabled and an initial
character is detected in T = 0 protocol mode.In EN709 mode, this field affects the order of bits the same
way as it does in normal mode.
Table continues on the next page...
Memory map and registers
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
1288
Preliminary
Freescale Semiconductor, Inc.
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